/*
 * A JavaScript implementation of the RSA Data Security, Inc. MD5 Message
 * Digest Algorithm, as defined in RFC 1321.
 * Version 2.1 Copyright (C) Paul Johnston 1999 - 2002.
 * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
 * Distributed under the BSD License
 * See http://pajhome.org.uk/crypt/md5 for more info.
 */

/*
 * Configurable variables. You may need to tweak these to be compatible with
 * the server-side, but the defaults work in most cases.
 */
var hexcase =
    0;

/* hex output format. 0 - lowercase; 1 - uppercase */
var b64pad =
    "";

/* base-64 pad character. "=" for strict RFC compliance */
var chrsz =
    8;

/* bits per input character. 8 - ASCII; 16 - Unicode */
/*
 * These are the functions you'll usually want to call
 * They take string arguments and return either hex or base-64 encoded strings
 */
function hex_md5(s) {
    return binl2hex(core_md5(str2binl(s), s.length * chrsz));
}

function b64_md5(s) {
    return binl2b64(core_md5(str2binl(s), s.length * chrsz));
}

export function str_md5(s) {
    return binl2str(core_md5(str2binl(s), s.length * chrsz));
}

function hex_hmac_md5(key, data) {
    return binl2hex(core_hmac_md5(key, data));
}

function b64_hmac_md5(key, data) {
    return binl2b64(core_hmac_md5(key, data));
}

function str_hmac_md5(key, data) {
    return binl2str(core_hmac_md5(key, data));
}

/*
 * Perform a simple self-test to see if the VM is working
 */
function md5_vm_test() {
    return hex_md5(
            "abc") ==
        "900150983cd24fb0d6963f7d28e17f72";
}

/*
 * Calculate the MD5 of an array of little-endian words, and a bit length
 */
function core_md5(x, len) {
    /* append padding */
    x[len >>
    5] |=
        0x80 << ((len) %
            32);
    x[(((len +
                64) >>>
            9) <<
        4) +
    14] = len;
    var a =
        1732584193;
    var b = -
        271733879;
    var c = -
        1732584194;
    var d =
        271733878;
    for (
        var i =
            0; i < x.length; i +=
            16) {
        var olda = a;
        var oldb = b;
        var oldc = c;
        var oldd = d;
        a = md5_ff(a, b, c, d, x[i +
            0],
            7, -
                680876936);
        d = md5_ff(d, a, b, c, x[i +
            1],
            12, -
                389564586);
        c = md5_ff(c, d, a, b, x[i +
            2],
            17,
            606105819);
        b = md5_ff(b, c, d, a, x[i +
            3],
            22, -
                1044525330);
        a = md5_ff(a, b, c, d, x[i +
            4],
            7, -
                176418897);
        d = md5_ff(d, a, b, c, x[i +
            5],
            12,
            1200080426);
        c = md5_ff(c, d, a, b, x[i +
            6],
            17, -
                1473231341);
        b = md5_ff(b, c, d, a, x[i +
            7],
            22, -
                45705983);
        a = md5_ff(a, b, c, d, x[i +
            8],
            7,
            1770035416);
        d = md5_ff(d, a, b, c, x[i +
            9],
            12, -
                1958414417);
        c = md5_ff(c, d, a, b, x[i +
            10],
            17, -
                42063);
        b = md5_ff(b, c, d, a, x[i +
            11],
            22, -
                1990404162);
        a = md5_ff(a, b, c, d, x[i +
            12],
            7,
            1804603682);
        d = md5_ff(d, a, b, c, x[i +
            13],
            12, -
                40341101);
        c = md5_ff(c, d, a, b, x[i +
            14],
            17, -
                1502002290);
        b = md5_ff(b, c, d, a, x[i +
            15],
            22,
            1236535329);
        a = md5_gg(a, b, c, d, x[i +
            1],
            5, -
                165796510);
        d = md5_gg(d, a, b, c, x[i +
            6],
            9, -
                1069501632);
        c = md5_gg(c, d, a, b, x[i +
            11],
            14,
            643717713);
        b = md5_gg(b, c, d, a, x[i +
            0],
            20, -
                373897302);
        a = md5_gg(a, b, c, d, x[i +
            5],
            5, -
                701558691);
        d = md5_gg(d, a, b, c, x[i +
            10],
            9,
            38016083);
        c = md5_gg(c, d, a, b, x[i +
            15],
            14, -
                660478335);
        b = md5_gg(b, c, d, a, x[i +
            4],
            20, -
                405537848);
        a = md5_gg(a, b, c, d, x[i +
            9],
            5,
            568446438);
        d = md5_gg(d, a, b, c, x[i +
            14],
            9, -
                1019803690);
        c = md5_gg(c, d, a, b, x[i +
            3],
            14, -
                187363961);
        b = md5_gg(b, c, d, a, x[i +
            8],
            20,
            1163531501);
        a = md5_gg(a, b, c, d, x[i +
            13],
            5, -
                1444681467);
        d = md5_gg(d, a, b, c, x[i +
            2],
            9, -
                51403784);
        c = md5_gg(c, d, a, b, x[i +
            7],
            14,
            1735328473);
        b = md5_gg(b, c, d, a, x[i +
            12],
            20, -
                1926607734);
        a = md5_hh(a, b, c, d, x[i +
            5],
            4, -
                378558);
        d = md5_hh(d, a, b, c, x[i +
            8],
            11, -
                2022574463);
        c = md5_hh(c, d, a, b, x[i +
            11],
            16,
            1839030562);
        b = md5_hh(b, c, d, a, x[i +
            14],
            23, -
                35309556);
        a = md5_hh(a, b, c, d, x[i +
            1],
            4, -
                1530992060);
        d = md5_hh(d, a, b, c, x[i +
            4],
            11,
            1272893353);
        c = md5_hh(c, d, a, b, x[i +
            7],
            16, -
                155497632);
        b = md5_hh(b, c, d, a, x[i +
            10],
            23, -
                1094730640);
        a = md5_hh(a, b, c, d, x[i +
            13],
            4,
            681279174);
        d = md5_hh(d, a, b, c, x[i +
            0],
            11, -
                358537222);
        c = md5_hh(c, d, a, b, x[i +
            3],
            16, -
                722521979);
        b = md5_hh(b, c, d, a, x[i +
            6],
            23,
            76029189);
        a = md5_hh(a, b, c, d, x[i +
            9],
            4, -
                640364487);
        d = md5_hh(d, a, b, c, x[i +
            12],
            11, -
                421815835);
        c = md5_hh(c, d, a, b, x[i +
            15],
            16,
            530742520);
        b = md5_hh(b, c, d, a, x[i +
            2],
            23, -
                995338651);
        a = md5_ii(a, b, c, d, x[i +
            0],
            6, -
                198630844);
        d = md5_ii(d, a, b, c, x[i +
            7],
            10,
            1126891415);
        c = md5_ii(c, d, a, b, x[i +
            14],
            15, -
                1416354905);
        b = md5_ii(b, c, d, a, x[i +
            5],
            21, -
                57434055);
        a = md5_ii(a, b, c, d, x[i +
            12],
            6,
            1700485571);
        d = md5_ii(d, a, b, c, x[i +
            3],
            10, -
                1894986606);
        c = md5_ii(c, d, a, b, x[i +
            10],
            15, -
                1051523);
        b = md5_ii(b, c, d, a, x[i +
            1],
            21, -
                2054922799);
        a = md5_ii(a, b, c, d, x[i +
            8],
            6,
            1873313359);
        d = md5_ii(d, a, b, c, x[i +
            15],
            10, -
                30611744);
        c = md5_ii(c, d, a, b, x[i +
            6],
            15, -
                1560198380);
        b = md5_ii(b, c, d, a, x[i +
            13],
            21,
            1309151649);
        a = md5_ii(a, b, c, d, x[i +
            4],
            6, -
                145523070);
        d = md5_ii(d, a, b, c, x[i +
            11],
            10, -
                1120210379);
        c = md5_ii(c, d, a, b, x[i +
            2],
            15,
            718787259);
        b = md5_ii(b, c, d, a, x[i +
            9],
            21, -
                343485551);
        a = safe_add(a, olda);
        b = safe_add(b, oldb);
        c = safe_add(c, oldc);
        d = safe_add(d, oldd);
    }
    return Array(a, b, c, d);
}

/*
 * These functions implement the four basic operations the algorithm uses.
 */
function md5_cmn(q, a, b, x, s, t) {
    return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s), b);
}

function md5_ff(a, b, c, d, x, s, t) {
    return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t);
}

function md5_gg(a, b, c, d, x, s, t) {
    return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t);
}

function md5_hh(a, b, c, d, x, s, t) {
    return md5_cmn(b ^ c ^ d, a, b, x, s, t);
}

function md5_ii(a, b, c, d, x, s, t) {
    return md5_cmn(c ^ (b | (~d)), a, b, x, s, t);
}

/*
 * Calculate the HMAC-MD5, of a key and some data
 */
function core_hmac_md5(key, data) {
    var bkey = str2binl(key);
    if (bkey.length >
        16) bkey = core_md5(bkey, key.length * chrsz);
    var ipad = Array(
            16),
        opad = Array(
            16);
    for (
        var i =
            0; i <
        16; i++) {
        ipad[i] = bkey[i] ^
            0x36363636;
        opad[i] = bkey[i] ^
            0x5C5C5C5C;
    }
    var hash = core_md5(ipad.concat(str2binl(data)),
        512 + data.length * chrsz);
    return core_md5(opad.concat(hash),
        512 +
        128);
}

/*
 * Add integers, wrapping at 2^32. This uses 16-bit operations internally
 * to work around bugs in some JS interpreters.
 */
function safe_add(x, y) {
    var lsw = (x &
        0xFFFF) + (y &
        0xFFFF);
    var msw = (x >>
        16) + (y >>
        16) + (lsw >>
        16);
    return (msw <<
        16) | (lsw &
        0xFFFF);
}

/*
 * Bitwise rotate a 32-bit number to the left.
 */
function bit_rol(num, cnt) {
    return (num << cnt) | (num >>> (
        32 - cnt));
}

/*
 * Convert a string to an array of little-endian words
 * If chrsz is ASCII, characters >255 have their hi-byte silently ignored.
 */
function str2binl(str) {
    var bin = Array();
    var mask = (
            1 << chrsz) -
        1;
    for (
        var i =
            0; i < str.length * chrsz; i += chrsz)
        bin[i >>
        5] |= (str.charCodeAt(i / chrsz) & mask) << (i %
            32);
    return bin;
}

/*
 * Convert an array of little-endian words to a string
 */
function binl2str(bin) {
    var str =
        "";
    var mask = (
            1 << chrsz) -
        1;
    for (
        var i =
            0; i < bin.length *
        32; i += chrsz)
        str += String.fromCharCode((bin[i >>
        5] >>> (i %
            32)) & mask);
    return str;
}

/*
 * Convert an array of little-endian words to a hex string.
 */
function binl2hex(binarray) {
    var hex_tab = hexcase ?
        "0123456789ABCDEF" :
        "0123456789abcdef";
    var str =
        "";
    for (
        var i =
            0; i < binarray.length *
        4; i++) {
        str += hex_tab.charAt((binarray[i >>
                2] >> ((i %
                        4) *
                    8 +
                    4)) &
                0xF) +
            hex_tab.charAt((binarray[i >>
                2] >> ((i %
                        4) *
                    8)) &
                0xF);
    }
    return str;
}

/*
 * Convert an array of little-endian words to a base-64 string
 */
function binl2b64(binarray) {
    var tab =
        "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
    var str =
        "";
    for (
        var i =
            0; i < binarray.length *
        4; i +=
            3) {
        var triplet = (((binarray[i >>
                        2] >>
                        8 * (i %
                            4)) &
                    0xFF) <<
                16) |
            (((binarray[i +
                        1 >>
                        2] >>
                        8 * ((i +
                                1) %
                            4)) &
                    0xFF) <<
                8) |
            ((binarray[i +
                    2 >>
                    2] >>
                    8 * ((i +
                            2) %
                        4)) &
                0xFF);
        for (
            var j =
                0; j <
            4; j++) {
            if (i *
                8 + j *
                6 > binarray.length *
                32) str += b64pad;
            else str += tab.charAt((triplet >>
                    6 * (
                        3 - j)) &
                0x3F);
        }
    }
    return str;
}
export default {
    hexMD5: hex_md5,
    b64Md5: b64_md5,
    strMd5: str_md5
}
